using UnityEngine;

namespace KirbyAdventures
{
    /// <summary>
    /// Procedural greybox for Phase A — Level_01_Forest.
    /// </summary>
    public static class Level01ForestBuilder
    {
        static Transform _root;

        public static void Build()
        {
            if (GameObject.Find("Level_01_Forest") != null)
                return;

            _root = new GameObject("Level_01_Forest").transform;

            EnsureLighting();
            BuildGroundAndPath();
            BuildJumpPlatforms();
            var startPos = new Vector3(0f, 1.1f, 0f);
            BuildCheckpoints();
            BuildStoryTriggers();
            BuildAbilityPedestal();
            BuildVillageGate();
            var player = BuildPlayer(startPos);
            BuildCamera(player);
            BuildKillPlane(player.transform);

            CheckpointSystem.EnsureStart(startPos, Quaternion.identity);
            CheckpointSystem.SetCheckpoint(startPos, Quaternion.identity, "start");

            DialogueUI.ShowTemporary("Кирби очнулся среди деревьев. Тропа ведёт к деревне — и к себе.", 4f);
        }

        static void EnsureLighting()
        {
            // Keep scene light; add one if missing
            if (Object.FindFirstObjectByType<Light>() == null)
            {
                var lightGo = new GameObject("Directional Light");
                lightGo.transform.SetParent(_root);
                var light = lightGo.AddComponent<Light>();
                light.type = LightType.Directional;
                light.color = new Color(1f, 0.95f, 0.85f);
                light.intensity = 1.1f;
                lightGo.transform.rotation = Quaternion.Euler(50f, -30f, 0f);
            }

            RenderSettings.ambientMode = UnityEngine.Rendering.AmbientMode.Trilight;
            RenderSettings.ambientSkyColor = new Color(0.45f, 0.55f, 0.65f);
            RenderSettings.ambientEquatorColor = new Color(0.35f, 0.4f, 0.3f);
            RenderSettings.ambientGroundColor = new Color(0.15f, 0.12f, 0.1f);
        }

        static void BuildGroundAndPath()
        {
            // Start platform
            CreateBox("StartPlatform", new Vector3(0f, 0f, 0f), new Vector3(10f, 1f, 10f),
                new Color(0.35f, 0.45f, 0.28f));

            // Forest path stretches
            CreateBox("Path_A", new Vector3(0f, 0f, 14f), new Vector3(6f, 1f, 16f),
                new Color(0.32f, 0.42f, 0.26f));
            CreateBox("Path_B", new Vector3(0f, 0f, 32f), new Vector3(5f, 1f, 12f),
                new Color(0.3f, 0.4f, 0.24f));

            // Side tree markers (cylinders)
            for (int i = 0; i < 8; i++)
            {
                float z = 4f + i * 5f;
                float x = (i % 2 == 0) ? -5.5f : 5.5f;
                var tree = CreatePrimitive(PrimitiveType.Cylinder, $"Tree_{i}",
                    new Vector3(x, 2f, z), new Vector3(0.6f, 2f, 0.6f),
                    new Color(0.2f, 0.28f, 0.15f));
                tree.transform.SetParent(_root);
            }
        }

        static void BuildJumpPlatforms()
        {
            // Gap then platforms
            CreateBox("Pad_1", new Vector3(0f, 0.5f, 42f), new Vector3(3.5f, 1f, 3.5f),
                new Color(0.45f, 0.38f, 0.28f));
            CreateBox("Pad_2", new Vector3(3f, 1.2f, 48f), new Vector3(3f, 1f, 3f),
                new Color(0.48f, 0.4f, 0.3f));
            CreateBox("Pad_3", new Vector3(-2f, 2f, 54f), new Vector3(3f, 1f, 3f),
                new Color(0.5f, 0.42f, 0.32f));
            CreateBox("Pad_4", new Vector3(0f, 2.5f, 61f), new Vector3(4f, 1f, 4f),
                new Color(0.4f, 0.45f, 0.3f));

            // Landing after mid section
            CreateBox("Path_C", new Vector3(0f, 0f, 72f), new Vector3(8f, 1f, 14f),
                new Color(0.33f, 0.42f, 0.27f));
            CreateBox("Path_D", new Vector3(0f, 0f, 90f), new Vector3(10f, 1f, 16f),
                new Color(0.36f, 0.44f, 0.3f));
            CreateBox("VillageApproach", new Vector3(0f, 0f, 108f), new Vector3(12f, 1f, 14f),
                new Color(0.4f, 0.4f, 0.35f));
        }

        static void BuildCheckpoints()
        {
            CreateCheckpoint("CP_Start", new Vector3(0f, 1.5f, 2f), new Vector3(4f, 2f, 2f), "cp_start");
            CreateCheckpoint("CP_Mid", new Vector3(0f, 3.5f, 61f), new Vector3(3f, 2f, 3f), "cp_mid");
            CreateCheckpoint("CP_NearGate", new Vector3(0f, 1.5f, 100f), new Vector3(5f, 2f, 3f), "cp_gate");
        }

        static void CreateCheckpoint(string name, Vector3 pos, Vector3 size, string id)
        {
            var go = new GameObject(name);
            go.transform.SetParent(_root);
            go.transform.position = pos;
            var box = go.AddComponent<BoxCollider>();
            box.isTrigger = true;
            box.size = size;
            var cp = go.AddComponent<Checkpoint>();
            cp.CheckpointId = id;

            var marker = CreatePrimitive(PrimitiveType.Cube, name + "_Marker",
                pos + Vector3.up * 0.5f, new Vector3(0.4f, 1.2f, 0.4f),
                new Color(0.2f, 0.7f, 0.9f, 0.7f));
            marker.transform.SetParent(go.transform);
            Object.Destroy(marker.GetComponent<Collider>());
            cp.SpawnPoint = go.transform;
        }

        static void BuildStoryTriggers()
        {
            CreateStory("Story_Fall", new Vector3(0f, 2f, 8f), new Vector3(6f, 3f, 3f),
                "«Падение»\nЗемля приняла его мягко, будто лес давно ждал чёрного кота.", 5f);
            CreateStory("Story_Road", new Vector3(0f, 2f, 28f), new Vector3(5f, 3f, 3f),
                "«Путь в деревню»\nТропа узкая, но шаг за шагом — и чужой шум становится тише.", 5f);
            CreateStory("Story_Source", new Vector3(0f, 3.5f, 74f), new Vector3(6f, 3f, 3f),
                "«Внутренний источник»\nСвет не нужно искать в небе — он уже греет изнутри.", 5f);
        }

        static void CreateStory(string name, Vector3 pos, Vector3 size, string quote, float secs)
        {
            var go = new GameObject(name);
            go.transform.SetParent(_root);
            go.transform.position = pos;
            var box = go.AddComponent<BoxCollider>();
            box.isTrigger = true;
            box.size = size;
            var st = go.AddComponent<StoryTrigger>();
            st.Quote = quote;
            st.DisplaySeconds = secs;
        }

        static void BuildAbilityPedestal()
        {
            var pedestal = CreatePrimitive(PrimitiveType.Cylinder, "LightPedestal",
                new Vector3(0f, 1.2f, 78f), new Vector3(1.4f, 0.6f, 1.4f),
                new Color(0.55f, 0.5f, 0.75f));
            pedestal.transform.SetParent(_root);

            var orb = CreatePrimitive(PrimitiveType.Sphere, "LightOrb",
                new Vector3(0f, 2.4f, 78f), Vector3.one * 0.7f,
                new Color(1f, 0.95f, 0.55f));
            orb.transform.SetParent(pedestal.transform);
            Object.Destroy(orb.GetComponent<Collider>());

            var trigger = new GameObject("AbilityUnlock");
            trigger.transform.SetParent(_root);
            trigger.transform.position = new Vector3(0f, 1.5f, 78f);
            var col = trigger.AddComponent<BoxCollider>();
            col.isTrigger = true;
            col.size = new Vector3(3.5f, 3f, 3.5f);
            trigger.AddComponent<AbilityUnlockPedestal>();
        }

        static void BuildVillageGate()
        {
            var posts = CreateBox("GatePosts", new Vector3(0f, 3f, 116f), new Vector3(8f, 6f, 1.2f),
                new Color(0.35f, 0.28f, 0.22f));
            // Hollow-ish: leave a door slab that moves
            var door = CreateBox("GateDoor", new Vector3(0f, 2.5f, 116.2f), new Vector3(3.2f, 4.5f, 0.6f),
                new Color(0.15f, 0.12f, 0.2f));
            var gate = door.AddComponent<LightGate>();
            gate.GateVisual = door.transform;

            // Invisible hit proxy in front
            var hit = new GameObject("GateLightTarget");
            hit.transform.SetParent(_root);
            hit.transform.position = new Vector3(0f, 2.5f, 115.5f);
            var hc = hit.AddComponent<BoxCollider>();
            hc.size = new Vector3(3.5f, 4.5f, 1.5f);
            // forward hits to LightGate via child relationship
            hit.transform.SetParent(door.transform);
            // LightGate is on door; GetComponentInParent will find it
        }

        static GameObject BuildPlayer(Vector3 pos)
        {
            // Black capsule named Kirby
            var body = CreatePrimitive(PrimitiveType.Capsule, "Kirby", pos, new Vector3(0.9f, 1f, 0.9f),
                new Color(0.05f, 0.05f, 0.08f));
            body.tag = "Player";
            Object.Destroy(body.GetComponent<Collider>());

            var cc = body.AddComponent<CharacterController>();
            cc.height = 2f;
            cc.radius = 0.45f;
            cc.center = new Vector3(0f, 0f, 0f);
            cc.skinWidth = 0.08f;

            var yaw = new GameObject("YawPivot");
            yaw.transform.SetParent(body.transform);
            yaw.transform.localPosition = Vector3.zero;

            var motor = body.AddComponent<PlayerMotor>();
            motor.YawPivot = yaw.transform;

            body.AddComponent<LightAbility>();

            return body;
        }

        static void BuildCamera(GameObject player)
        {
            Camera cam = Camera.main;
            if (cam == null)
            {
                var camGo = new GameObject("Main Camera");
                cam = camGo.AddComponent<Camera>();
                cam.tag = "MainCamera";
                camGo.AddComponent<AudioListener>();
            }

            var follow = cam.GetComponent<SimpleCameraFollow>();
            if (follow == null)
                follow = cam.gameObject.AddComponent<SimpleCameraFollow>();

            var motor = player.GetComponent<PlayerMotor>();
            Transform yaw = player.transform.Find("YawPivot");
            follow.Target = player.transform;
            follow.YawPivot = yaw;
            motor.CameraTransform = cam.transform;
            motor.YawPivot = yaw;

            cam.transform.position = player.transform.position + new Vector3(0f, 2.5f, -5.5f);
            cam.transform.LookAt(player.transform.position + Vector3.up * 1.2f);
        }

        static void BuildKillPlane(Transform player)
        {
            var go = new GameObject("FallKillPlane");
            go.transform.SetParent(_root);
            var kill = go.AddComponent<FallKillPlane>();
            kill.KillY = -10f;
            kill.Bind(player);
        }

        static GameObject CreateBox(string name, Vector3 pos, Vector3 scale, Color color)
        {
            var go = CreatePrimitive(PrimitiveType.Cube, name, pos, scale, color);
            go.transform.SetParent(_root);
            return go;
        }

        static GameObject CreatePrimitive(PrimitiveType type, string name, Vector3 pos, Vector3 scale, Color color)
        {
            var go = GameObject.CreatePrimitive(type);
            go.name = name;
            go.transform.position = pos;
            go.transform.localScale = scale;
            var rend = go.GetComponent<Renderer>();
            if (rend != null)
            {
                // URP Lit may exist after package import; fallback to Standard / Unlit
                var shader = Shader.Find("Universal Render Pipeline/Lit");
                if (shader == null) shader = Shader.Find("Standard");
                if (shader == null) shader = Shader.Find("Sprites/Default");
                if (shader != null)
                {
                    var mat = new Material(shader);
                    if (mat.HasProperty("_BaseColor"))
                        mat.SetColor("_BaseColor", color);
                    else if (mat.HasProperty("_Color"))
                        mat.SetColor("_Color", color);
                    else
                        mat.color = color;
                    rend.material = mat;
                }
                else
                {
                    rend.material.color = color;
                }
            }
            return go;
        }
    }
}